<!DOCTYPE html>
<!-- meta refresh in <template> works in some old browsers (e.g. Firefox 68) -->
<div></div>
<script>
var d = document.querySelector('div');
var s = d.attachShadow({mode: 'open'});
s.innerHTML = `
<meta charset="Big5">
<meta http-equiv="content-type" content="text/html; charset=Big5">
<meta http-equiv="Content-Security-Policy" content="default-src 'nonce-2726c7f26c';">
<meta http-equiv="refresh" content="0; url=nonexist.html">
`;
</script>
